You've heard for years that a brighter room can boost your mood—even science backs it up—but aside from tearing down your walls and calling in the pros to install floor-to-ceiling windows and new lights everywhere, what can you do? And what are some genuinely affordable options, since we're not all budding HGTV stars? That's why we turned to Alyssa Rosenheck: As a top interiors photographer and stylist (not to mention author of the upcoming book, The New Southern Style), she knows a thing or two about maximizing light in a space. And, lucky for us, she was kind enough to share her secrets.